判断( )在空间中一个角的两边与另一个角的两边分别平行,则这两个角相等或互补.
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Where does Mark work now?
A. He works in a car factory.
B. He works in a car
C. He works in a factory that makes semi-trailers.
How long does it take to build a semi-trailer in Mark's new factory?
A. It takes between one to two months
B. It takes eight weeks.
C. It takes eight months.
Why did the cost of a Model T car drop after the introduction of the assembly line?
A. The products were more efficient.
B. The production was more efficient.
C. The assembly line was cheaper.
Who are more likely to make mistakes at work?
A. Workers who are tired.
B. Workers who are bored.
C. Workers who drill holes.
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